Developer: Nic Westlake

Visit www.rkalk.com to see video tutorials on powerful RK-83 features!

Don't spend $100+ on an old fashioned graphing calculator. Get all these features (plus more added with every FREE...

Welcome to version 0.9a of RK-89.

RK-89 is the latest release in the most advanced graphing calculator suite available on the App Store. RK-89 introduces symbolic calculation features to...

...for when you just need to know.

Don't spend another second wondering if that number is prime. Check it! Primes will give you a lightning quick verdict. If your integer is not prime,...

...for when you just need to know.

Don't spend another second wondering if that number is prime. Check it! Primes Lite will give you a lightning quick verdict.

Upgrade to the...